Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa71c9752f45242…

MALICIOUS

PDF

82.0 KB Created: 2021-03-14 19:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 50110b74dc796c2ad7647f749023ea7b SHA-1: 86234b299361dc44f327330167631aaf32f1c08a SHA-256: 4aa71c9752f452422b7554bef19319167e4511321649168ce97af076cc95d205
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a phishing or link farm operation. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through a large number of links. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or redirection attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/123?utm_term=keloid+silicone+gel+sheets PDF link annotation
    • http://wordsidepost.top/should_i_watch_altered_carbon_resleeved_before_season_20bz7a.pdfIn PDF document text
    • http://rodina38.ru/the_sign_of_four_book_coveridhig.pdfIn PDF document text
    • http://streamsweets.com/fl_studio_12_free_download_for_pc_windows_8w3x26.pdfIn PDF document text
    • http://fishing-rods2.club/38679397530f2p2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5fcb5cf0153d1.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/12984486932.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/igFrThj/28089406550.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/46683639284.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/how_do_you_fix_a_golf_cart_battery_charger.pdfIn PDF document text
    • http://yellownatural.space/mexican_bingo_cards_near_meqghvs.pdfIn PDF document text
    • https://cdn.sqhk.co/jilelemo/fhbyghf/amazing_3d_sculpture_artists.pdfIn PDF document text
    • http://wownatural.fun/rojinuzolisuxejekejnm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_5fd03a4cef493.pdfIn PDF document text
    • http://olymp-trade.top/how_s_life_funny_answersk6ghz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fe73b4fc4860.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/arabiyyah_bayna_yadayk_book_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fovezewi/vidmate_apps_2018_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/lady_bird_lake_bass_fishing_report.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 4864 bytes
SHA-256: 1239d194d648e02527d4fafd4b21f6af9b439b6b5489a69cc46db6c33aa8f49c
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 11176 bytes
SHA-256: ddfc1c14fcf405eefb0819986667615e58c1a58343ef2d9cdd597b12e85b98b2
font_02_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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